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Related Experiment Videos

Quantitative differences between complement factor-B phenotypes

J P Mortensen, L U Lamm

    Immunology
    |April 1, 1981
    PubMed
    Summary

    Individuals with the BfF allele have higher Factor B serum levels and may better resist infections compared to BfS subjects. This suggests the BfF allele could be replacing BfS through natural selection.

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    Area of Science:

    • Immunogenetics
    • Human Genetics
    • Biochemistry

    Background:

    • The complement system plays a crucial role in innate immunity.
    • Factor B (Bf) is a key component of the alternative pathway of complement activation.
    • Structural polymorphism of Factor B (Bf) has been linked to variations in serum levels and immune function.

    Purpose of the Study:

    • To investigate the relationship between Factor B structural phenotypes and serum levels.
    • To assess the functional consequences of Factor B polymorphism on immune response.
    • To explore the potential selective pressures acting on Factor B alleles.

    Main Methods:

    • High-voltage electrophoresis and immunofixation for structural polymorphism determination.
    • Rocket-immunoelectrophoresis for quantitative measurement of serum Factor B levels.
    • Functional assay using agarose plates to assess Factor B activity.

    Main Results:

    • Significant variations in mean Factor B serum levels were observed across structural phenotypes: BfF > BfFS > BfS.
    • A similar trend was noted in functional assays, though with less precision.
    • Individuals with the BfF allele demonstrated potentially enhanced resistance to infectious agents.

    Conclusions:

    • Factor B structural phenotypes are associated with significant differences in serum levels and functional activity.
    • The BfF allele may confer a survival advantage, potentially leading to its replacement of the BfS allele via natural selection.
    • Bf polymorphism could be a dynamic evolutionary process driven by infectious disease pressure.

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